Who watches the Watchers? Dark Void video clip

You will find below a mix of edited cut scene clips from Dark Void which attempt to showcase the "bad guys" of the upcoming game. After watching this short video multiple times I'm still confused on what or who The Watchers are. Are they Alien shape shifters that can take the forms of humans? Parasitic organisisms that can pilot both biological and mechanical hosts? Are the metal warriors their tools or their battle suits? This is less of a teaser video and more of a "what just happened?" video.